Cylinder-desk



2 Sheets-f-Shet 1.

(ModeL) C. BLAKE.

CYLINDER DESK.

Patented Nov. 8,1881.

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a y w 2 0. BLAKE.

CYLINDER DESK.

.No.249,292.= PatentedNov.8,1881.

- 1 I Nrrnn STATES PATENT Friend 7 CHRISTOPHER BLAKE, F BOSTON,MASSACHUSETTS.

CYLINDER-DESK.

SPECIFICATION forming part of Letters Patent No. 249,292QdatedNovember8, 188

v Application filed October 18, 1880. (ModeL) 1" 0 all whom "it mayconcern:

Be it known that I, CHRISTOPHER BLAKE, a citizen of the United States,residing at'Boston, in the county of Suffolk and State of Massachusetts,have invented an Improvement in Cylinder-Desks, ofwhich the following isafull, clear, and exact description, reference being had to theaccompanying drawings, making part of this specification, in whichFigure 1 is a perspective view of a cylinderdesk constructed inaccordance with my invention. Fig. 2 is a longitudinal vertical sectionthrough the same. Fig. 3 is a transverse vertical section on the line mw of Fig. 2.

My present invention relates particularly to that class of desks wellknown as cylinderdesks; and it consists in the combination of a singlelever with a single link for connecting the cylindrical top with thehorizontal slide, whereby the single operation of opening or closingonewill open or close the other, as desired, the two pieces constitutingthis connection affording a construction of the greatest simplicity.

In the said drawings, A A represent the sides of the desk, between whichis fitted the revolving top B,made in theform of asegment of a hollowcylinder, which, when closed or shut down, rests with its lower edge, 5,upon the slide or sliding table G, which forms, when drawn out, thewriting-surface of the desk.

The top B has secured to it at each end a radial arm or lever, D, whichis pivoted at'a to the contiguous side A, these two levers serving tosupport the top B,which reciprocates i nthe are of a circle around thepivots a as a center, its backward motion being limited by stops 6.

To the lower end of the arm I) of each lever D is pivoted one end of alink, E, the opposite end of which is pivoted at c' to the adjacent edgeor side bar of. the slide G, and by means of these connections, as thetop B is revolved or thrown back to open the desk by taking hold of theknob d, the levers D are reciprocated on their pivots a, and the slidingtable 0 thus thrown out horizontally in the proper position to form aconvenient writing-surface, and when the top B is rotated forward, or inthe opposite direction to close the desk, the

the way, as desired, a single movement only of the hand being requiredto throw back the top and push out the slide, or vice versa, instead oftwo separate movements, one to rotate the top and the other to move theslide, as has heretofore been necessary in desks of this description.

It is,evident that the top may be rotated in either direction by takinghold of and moving the slide; but the usual method ot' opening the deskis by taking hold of and rotating the top B, while in closing it therotation of the top is most commonly effected by pushing in the slide.The top, however, may be operated by the slide, or the slide by the top,as may be found most convenient.

The rear portion of the desk is provided, as A usual, with pigeon-holesor compartments and drawers, which are arranged within aquartoeylindrical case, G, over which the top B is rotated as the deskis opened and closed.

A desk constructed as above described is simple, convenient, easilyoperated, and not liable to get out of repair, while it is exceedinglycompact, thus especially adapting it for parlors, libraries, 82c.

Instead of connecting both levers D with the slide 0, one only may beconnected therewith, the link E at the other side of the desk beingdispensed with. I prefer, however, to

connect both levers with the slide, as shown, as it equalizes the strainand renders the parts less liable to get out of order.

I am aware that other lever-anddink connections have been employed foraccomplishing the desired result-via, the simultaneous opening orclosing of both the top and the slide by the single application of onehand to either. For instance, one connection consists of a lever and twolinks and two pivots, one pivot for the top, separate and independent ofthe pivot on which the lever is fulcrumed, the lever having a link atits upper end. secured indirectly (by a segmental plate) to thecylindrical top, and a link at its lower end secured to the slide; butmy connection shows the top supported by, not pivoted to, a lever, thusreducin g the number of pivotal points, and with but one link, being, asI believe, the least numher of pieces for this purpose at presentemslide G will be simultaneouslydrawn in out of I ployed.

What I claim as my invention, and desire opening or closing of both thetop and slide 10 to secure by Letters Patent, is is insured by a singleapplication of the hand The combination, with the cylindrical top toeither, substantially as described. B and horizontal slide 0, of thelever D and Witness my hand this 8th day of-October, 5 link E, the leverbeing pivoted at a, for sup- A. D. 1880.

porting and admitting the movement of the CHRISTOPHER BLAKE. top in anarc of a circle, and the link having In presence ofits lower end pivotedto said lever and its up- P. E. TESOHEMAOHER,

per end to the slide, whereby the simultaneous O. E. CUMINGS.

